PLZ HELP IM SO CONFUSED What have you learned about the slopes and y-intercepts of those three graphs?

See below.

Step-by-step explanation:

Part A:

The two lines have the same slope and different y-intercepts. The graphs of the two equations are parallel lines, so there is no solution.

Part B:

The two lines are really the same line with the same slope and y-intercept. Therefore every point on the line is a solution. There is an infinite number of solutions.

Part C.

The two lines have different slopes, so they intersect at a single point. Therefore, there is one solution.

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m